Method of making composite sintered artifact
AssigneeLillywyte Societe Anonyme
InventorsJonathan L. Albain, Adrian W. Paterson
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Abstract
A method is disclosed of making a sintered composite unitary artifact having an alpha-alumina component fast with a metal component. Particulate alpha-alumina and a glass-forming additive are mixed together; and a green artifact is pressed having an alumina portion formed from the mixture and a metal portion formed from a particulate metal. The green artifact is then heated under a non-oxidizing atmosphere to a temperature at which both portions undergo densification. This provides a sintered artifact having a debased alpha-alumina component sintered to a metal artifact.
Claims12
A method of making a composite unitary sintered artifact comprising an .alpha.-alumina component and a metal fast with each other, the method comprising the steps of:
- mixing together, to form a powder mixture, 90-99% by mass of particulate .alpha.-alumina and 1-10% mass of at least one particulate additive which, when dispersed in particulate form in particulate .alpha.-alumina, lowers the temperature at which densification of the .alpha.-alumina in response to heating takes place;
- pressing, from said mixture and a metal powder, a composite green artifact having an alumina portion formed from said mixture and a metal portion formed from said metal powder;
- and
- heating, after relieving the pressing, the green artifact under a non-oxidizing atmosphere to a temperature at which both the portions undergo densification, to provide a composite sintered artifact comprising a debased .alpha.-alumina component and a metal component.
Dependencies are inferred from the claim text.